I agree about documentation, as a retired IT pro it was both the bane of my life and the saviour!
For some background, my home network has around 30 devices including PCs, tablets, phones, smart TV's, Sky boxes, Sonos speakers, Amazon Echo's, a PS4, printer and NAS. In addition there are around another 20 smart plugs, lights, bridges etc.
Even next to the main Smart Hub 2 router, I don't get better than 600Mb download on WiFi and about 250Mb next to the mini disc in a room not 20 feet away. I would expect more from Full Fibre 900.
The BT hub doesn't support any way of segregating traffic or devices so I'm thinking of replacing it with something that can. VLANs are what I have worked with in the past but I'm now seeing references to "IoT network & Device Isolation" in specs on, for example, the tp-link Deco XE75 so I am hoping that something like this can improve things.
I'm not asking for any recommendations on third party devices as such, just advice that I am looking at this in the right way.
Or maybe I ditch all my WiFi based smart stuff and replace with Zigbee 😞